This week’s cold front isn’t just bringing out sweaters, it’s driving up prices at the pump. Gas in Tampa Bay vaulted 15 cents over the past week to $2.41 per gallon Monday, tripling the national jump of 5 cents to $2.49 per gallon, according to AAA The Auto Club Group. The spike, said gas tracker GasBuddy.com, is because of a combination of oil prices and cold weather."Keep in mind oil prices are among the highest we’ve witnessed in over two years," Patrick DeHaan, GasBuddy petroleum analyst, said in a release. "And we’re in the middle of a severe cold snap, one which is likely to drive up demand for heating oil, propane and other petroleum products."State gas prices were $2.44 per gallon on Monday, up 9 cents over the week.